擦 大哥week04-旋轉Rotate

 week04-旋轉Rotate

    新指令:glratatef ( 角度 x,y,z )

    矩陣:Matrix

    利用 mouse motion 來控制

week04-1 

    下載課本範例 跑transformation.exe

    網址:https://jsyeh.org/3dcq10/

week04-2

    右手座標系統, 把手掌從x掃到y時, 由姆指的方向決定z軸的方向

    右手姆指當旋轉軸, 再看你的其餘4指是往哪個方向轉

week04-3

    

    兩軸旋轉 思考旋轉方向

week04-4

    #include <GL/glut.h>

float angle = 0; ///step02-1 宣告global全域變數 angle

void display()

{

    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); ///背景

    glPushMatrix(); ///矩陣

        glRotatef(angle, 0, 1, 0); ///角度

        glutSolidTeapot( 0.3 );

    glPopMatrix();  ///還原矩陣

    glutSwapBuffers();

    angle++; ///把角度++

}

int main(int argc, char* argv[] )

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB|GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week04");

    glutDisplayFunc(display);

    glutIdleFunc(display); ///step02-1 有空idle時,就重畫畫面

    glutMainLoop();

}

week04-5

加上打光的效果

const GLfloat light_ambient[]  = { 0.0f, 0.0f, 0.0f, 1.0f };

const GLfloat light_diffuse[]  = { 1.0f, 1.0f, 1.0f, 1.0f };

const GLfloat light_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f };

const GLfloat light_position[] = { 2.0f, 5.0f, 5.0f, 0.0f };

const GLfloat mat_ambient[]    = { 0.7f, 0.7f, 0.7f, 1.0f };

const GLfloat mat_diffuse[]    = { 0.8f, 0.8f, 0.8f, 1.0f };

const GLfloat mat_specular[]   = { 1.0f, 1.0f, 1.0f, 1.0f };

const GLfloat high_shininess[] = { 100.0f };

week04-6

    glClearColor(1,1,1,1); ///Step02-3 用來清背景的色彩 R,G,B,A

    ///(目前GLUT_RGB不會用到 A)

    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); ///清背景

    glPushMatrix(); ///step02-1 備份矩陣

        glRotatef(angle, 0, 1, 0); ///step02-1 旋轉 angle 角度

        glColor3f(1,1,0); ///step02-3 加點色彩

        glutSolidTeapot( 0.3 );

    glPopMatrix();  ///step02-1 還原矩陣

    glutSwapBuffers();

    angle++; ///step02-1 把角度++

    '''cpp

 #include <GL/glut.h>

const GLfloat light_ambient[]  = { 0.0f, 0.0f, 0.0f, 1.0f };

const GLfloat light_diffuse[]  = { 1.0f, 1.0f, 1.0f, 1.0f };

const GLfloat light_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f };

const GLfloat light_position[] = { 2.0f, 5.0f, 5.0f, 0.0f };

const GLfloat mat_ambient[]    = { 0.7f, 0.7f, 0.7f, 1.0f };

const GLfloat mat_diffuse[]    = { 0.8f, 0.8f, 0.8f, 1.0f };

const GLfloat mat_specular[]   = { 1.0f, 1.0f, 1.0f, 1.0f };

const GLfloat high_shininess[] = { 100.0f };

void myLight(){

    glEnable(GL_DEPTH_TEST);

    glDepthFunc(GL_LESS);

    glEnable(GL_LIGHT0);

    glEnable(GL_NORMALIZE);

    glEnable(GL_COLOR_MATERIAL);

    glEnable(GL_LIGHTING);

    glLightfv(GL_LIGHT0, GL_AMBIENT,  light_ambient);

    glLightfv(GL_LIGHT0, GL_DIFFUSE,  light_diffuse);

    glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);

    glLightfv(GL_LIGHT0, GL_POSITION, light_position);

    glMaterialfv(GL_FRONT, GL_AMBIENT,   mat_ambient);

    glMaterialfv(GL_FRONT, GL_DIFFUSE,   mat_diffuse);

    glMaterialfv(GL_FRONT, GL_SPECULAR,  mat_specular);

    glMaterialfv(GL_FRONT, GL_SHININESS, high_shininess);

}

float angle = 0;

void display()

{

    glClearColor(1,1,1,1); ///Step02-3 用來清背景的色彩 R,G,B,A

    ///(目前GLUT_RGB不會用到 A)

    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); ///清背景

    glPushMatrix(); ///step02-1 備份矩陣

        glRotatef(angle, 0, 1, 0); ///step02-1 旋轉 angle 角度

        glColor3f(1,1,0); ///step02-3 加點色彩

        glutSolidTeapot( 0.3 );

    glPopMatrix();  ///step02-1 還原矩陣

    glutSwapBuffers();

    angle++; ///step02-1 把角度++

}

int main(int argc, char *argv[])

{

glutInit(&argc, argv);

glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

glutCreateWindow("GLUT Shapes");

glutDisplayFunc(display);

glutIdleFunc(display);

myLight();

glutMainLoop();

}

week04-7

紅字上下顛倒 旋轉方式不同

#include <GL/glut.h>

float angle = 0;

void display()

{

    glEnable(GL_DEPTH_TEST);

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

    glTranslatef(0.6,0,0);

    glRotatef(angle,0,1,0);

    glutSolidTeapot(0.3);

    glColor3f(1,1,0);

    glPopMatrix();

    glPushMatrix();

    glRotatef(angle,0,1,0);

    glTranslatef(0.6,0,0);

    glutSolidTeapot(0.3);

    glColor3f(1,0,0);

    glPopMatrix();

    glutSwapBuffers();

    angle++;

}

int main(int argc, char *argv[])

{

glutInit(&argc, argv);

glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

glutCreateWindow("GLUT Shapes");

glutDisplayFunc(display);

glutIdleFunc(display);

 glutMainLoop();

}